Coupeville is located in Island county Washington with a geographic area of 1.3 square miles. The total population in Coupeville is 1,850 with 47.1% male and 52.9% female. Children under age 5 represent 2.7% of the population, under age 18 equal 10.5% of the population and over age 65 is 46.3% of the population. The median household income is $61,607, per capita income is $39,216. There are a total of 827 housing units with 63.6% owner occupied. Education includes 12.0% of residents that are high school graduates and 43.5% with a bachelor's degree or higher. The average temperature in Coupeville in the summer is 60 degrees, and in the winter 42 degrees.